3 timers with 7-segment displays

3 timers with 7-segment displays

I was searching for an easy to use LED timer with 3 individual timer times shown at once but I could not find one. So I made this one I would like to share it with you too. =)

Functions:

• 3 separate timers counting down to 00.00.00.
• The remaining time of the timers is shown in the 3 different 8 digit 7-segment displays.
• The timers tick down each second.
• The timers can be started, stopped and deleted individually.
• The running timers can be deleted separately or together.
• Planned functions in one of the next versions: 
  • Notification about the timers with Telegram to your smart phone.
  • Hide timer display when timer not set.
  • Replace 1,2,3 at the beginning with A,B,C. Currently a bug in the Arduino library.

Usage:

Parts needed: 

• 1x ESP32 NodeMCU 
• 1x 4x4 Matrix keypad
• 3x MAX7219 LED 7-segment display TM1637
• 1x Micro-USB cable
• 1x USB 5V/2A power supply 
• 1x Some wires in different colors
• 6x M3x35mm countersunk screws
• 1x Small cable tie to secure the USB cable and ESP32 in the case

Wiring instructions:

Code download:

• The code can be found on my GitHub repository.

Printing instructions:

• 0.3 draft profile used
• Textured sheet used
• No supports required 
• No brim required

Happy printing =)